msnyder1{at}cfl.rr.com wrote:
> On 08/30/06 at 10:35 PM, "Derek W. Keoughan"
 said:
> 
> 
>> General rule of thumb I've seen is to set the aperture to twice the 
>> card's RAM, so in your case, 64MB.
> 
>> Not even sure if performance under OS/2 or eCS would be affected by this 
>> setting - never tested it to find out.
> 
>> Hope this helps (if only for knowing the "usual setting").
> 
> A google search yielded several hits on this.  Here's one of them:
> 
> http://www.techpowerup.com/articles/overclocking/vidcard/43

Thanks for the URL.  I didn't go looking on Google - was just recalling 
things I've seen on various tech sites over the years.  None went into 
as much detail as your URL though.

The video memory is probably _never_ used up in an OS/2 or eCS machine, 
as very few 3D apps requiring texture mapping (and taking advantage of 
the video card's RAM) even exist, if at all.

I would think the best you're going to see used is 3x the page frame to 
display a static frame.  1024x768x24bit = 2.25MB x3 (triple Z-buffer) = 
6.75MB of RAM used.  Depends on the card, the driver used, and the 
support level of the graphics chip.

Now if you dual-boot to Windows or Linux or some other OS that uses the 
full 3D acceleration of the card and stores textures and such in video 
RAM, you'd give the card more of a workout, and perhaps the AGP aperture 
setting would actually matter. :)

In a machine with less than 4GB of physical RAM installed, it wouldn't 
make a bit of difference what size the aperture is set to, as the GART 
will assign addresses above the physical limit of the installed RAM for 
its maps, if I'm reading that right.  Highest aperture I've seen thus 
far is 256MB.

-Derek


-- 

Derek W. Keoughan,
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